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Question 47

Which element is not present in Nessler's reagent?

Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II)

Its chemical formula is:

$$\ K_2\left[HgI\right]_4$$

Based on this formula, the elements present are:

  • K: Potassium
  • Hg: Mercury
  • I: Iodine

Oxygen is not a constituent element of the reagent itself.

The correct answer is Option D. Oxygen

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